Vehicle using action-reaction principle

ABSTRACT

A vehicle using an action-reaction principle is proposed. More particularly, there is proposed a vehicle using an action-reaction principle, the vehicle being able to be moved forward by reaction that is generated when a propelling member repeatedly slides.

TECHNICAL FIELD

The present disclosure relates to a vehicle using an action-reaction principle and, more particularly, to a vehicle using an action-reaction principle, the vehicle being able to be moved forward by reaction that is generated when a propelling member repeatedly slides.

BACKGROUND ART

In general, leisure boats or small fishing boats that are driven by man power are usually configured to be able to be propelled by paddling that is a propelling means. However, there is a problem that since paddling for propelling requires very skillful complex motions, it is very hard and difficult to people who are not familiar with paddling.

Some mechanical propelling apparatuses that partially solve these problems, that is, apparatuses configured to be able to move forward by rotating a propeller when pedals are depressed have been proposed. However, most propelling apparatuses composed of several parts subordinately fixed and installed in boats. Accordingly, not only it is difficult to separately carry and assemble/disassemble a boat and the propelling apparatuses, but the structures are complicated, so a large installation space is required. Accordingly, it is difficult to actually apply the propelling apparatuses.

There is Korean Patent Application Publication No. 10-2003-0045755 (hereafter, referred to as a related art), which is one of related arts about a non-powered propelling apparatus that is used for boats, etc.

According to the related art, webbed parts that can rotate 360 degrees are disposed on both sides of a boat, so when a user rotates the webbed parts, the boat can be moved forward.

That is, according to the related art, since a thrust that pushes the boat forward is obtained by rotating the webbed parts in one direction, the webbed parts should be rotated fast to move fast the boat, and accordingly, there is a problem that considerable man power is required.

DISCLOSURE Technical Problem

The present disclosure has been made in an effort to solve the problems in the related art and an objective of the present disclosure is to provide a vehicle using an action-reaction principle, the vehicle being able to be moved forward by reaction that is generated when a propelling member repeatedly slides.

Technical Solution

According to the present disclosure, a vehicle using an action-reaction principle is configured to be able to carry people and configured to be operated on water. The vehicle includes: a body 100 configured to be able to carry people and having a predetermined volume; a propelling member 200 disposed on the body 100 to be able to slide and reciprocate; and a blade 300 disposed on a side of the propelling member 200 to be able to rotate forward and backward and provided to be submerged in water, in which when the propelling member 200 is moved to a first side in a longitudinal direction, the blade 300 is unfolded and the body 100 is moved to a second side in the longitudinal direction by reaction generated by the water flow.

According to the present disclosure, a vehicle using an action-reaction principle is configured to be able to carry people and configured to be operated on water. The vehicle includes: a body 100 configured to be able to carry people and having a predetermined volume; a propelling member 200 provided to be able to slide and reciprocate downward at an angle on the body 100; and a blade 300 disposed on a side of the propelling member 200 to be able to rotate forward and backward and provided to be submerged in water, in which when the propelling member 200 is moved downward at an angle to a first side in a longitudinal direction, the blade 300 is unfolded and the body 100 is moved to a second side in a longitudinal direction by reaction generated by the water flow.

According to the present disclosure, a vehicle using an action-reaction principle which is configured to be able to carry people and configured to be operated on water. The vehicle includes: a body 100 configured to be able to carry people and having a predetermined volume; a propelling member 200 disposed on a side of the body 100 to be able to longitudinally reciprocate like a pendulum; and a blade 300 disposed on a side of the propelling member 200 to be able to rotate forward and backward and provided to be submerged in water, in which when the propelling member 200 is moved downward at an angle to a first side in a longitudinal direction, the blade 300 is unfolded and the body 100 is moved to a second side in the longitudinal direction by reaction generated by the water flow.

The blade 300 may include a blade holder 310 hinge-fastened to the propelling member 200 to rotate within set angle ranges.

The blade holder 310 may include: a rotation groove 311 concaved inward on a surface of the propelling member 200 and hinge-fastened with one end of the blade 300 inserted therein; a first stopper surface 312 forming a side of the rotation groove 311 and disposed in a vertical plane; and a second stopper surface 313 disposed to make a predetermined angle with the first stopper surface 312.

Assuming that the vertical plane that the first stopper surface 312 faces is a reference angle of 0 degrees, a clockwise direction from the reference angle is a forward direction+direction, and a rotation angle of the blade 300 is α, the second stopper surface 313 may be configured such that the blade 300 can rotate minimum 0 degrees to maximum α degrees or minimum −α degrees to maximum 0 degrees, and the rotation angle is 0<α≤90.

The blade holder may further include an assistant seat 320 that is a plate having a predetermined area, has a flow hole 321 formed through a center thereof, and faces the blade 300.

The blade 300 may further include a first protrusion 330 bent or curved toward the assistant seat 320 at a second end thereof.

The body 100 may be the hull of a boat, a sports structure, an aquatic structure, or a leisure structure.

Advantageous Effects

According to the present disclosure, a vehicle is configured to be able to move forward using the force of reaction that is applied to a blade when a propelling member is reciprocated, so there is an advantage that it is possible to generate a thrust through a simple configuration without using a specific power source.

According to the present disclosure, there is an advantage that it is possible to form various structures by combining various leisure structure, aquatic structure, boats, etc.

DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a vehicle using an action-reaction principle according to the present disclosure;

FIG. 2A is a plan view of the vehicle using an action-reaction principle according to the present disclosure;

FIGS. 2B and 2C are plan views of other embodiments of a blade holder that are applied to the present disclosure;

FIGS. 3A to 3C are embodiments according to the difference of the number of blades that are applied to the present disclosure;

FIGS. 4A and 4B are other embodiment of the blade that are applied to the present disclosure;

FIG. 5A is a view showing a propelling process of the vehicle according to the present disclosure;

FIG. 5B is a view showing a returning process of the vehicle according to the present disclosure;

FIG. 6 is an embodiment of an assistant seat that is applied to the present disclosure;

FIGS. 7A and 7B are views showing an embodiment of using the assistant seat that is applied to the present disclosure;

FIGS. 8A and 8B are views another embodiment of a blade and an assistant seat that are applied to the present disclosure;

FIG. 9 is a view showing an embodiment of an assistant propelling part that is applied to the present disclosure;

FIGS. 10A and 10B are perspective views of another embodiment of a vehicle using an action-reaction principle according to the present disclosure; and

FIGS. 11A and 11B are views of another embodiment of a vehicle using an action-reaction principle according to the present disclosure.

DESCRIPTION OF REFERENCE NUMERALS

100: body

200: propelling member

300: blade 310: blade holder

311: rotation groove 312: first stopper surface

313: second stopper surface

320: assistant seat 321: flow hole

330: first protrusion 340: second protrusion

400: assistant propelling part 410: assistant flow hole

420: assistant blade 430: stopping step

MODE FOR INVENTION

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present disclosure relates to a vehicle using an action-reaction principle and, more particularly, to a vehicle using an action-reaction principle, the vehicle being able to be propelled without power by reaction that is generated when a propelling member reciprocates in one direction.

The present disclosure, as shown in FIGS. 1 and 2, relates to a vehicle that is configured to be able to carry people and is operated on water. The vehicle includes a body 100, a propelling member 200, and a blade 300.

The body 100, which is moved forward by a reaction force that is generated by resistance of water that is applied to the blade 300, is configured to be able to carry people, and has a predetermined volume.

The body 100 may be various types of objects that can be moved forward on water. In detail, the body 100 may be the hull of a boat, a sports structure, an aquatic structure, a leisure structure, or the like, but is not limited thereto and may be various structures that can be operated while having the propelling member 200 and the blade 300.

For example, when the body 100 is formed in a boat type, the propelling member 200 is disposed on the top or a side of the body 100 and slides and reciprocates in one direction such that the blade 300 is folded or unfolded. When the body 100 is formed in a machine type such as an elliptical machine, the propelling member 200 may be disposed at the lower end of the elliptical machine and the blade 300 may be slid and reciprocated in one direction to be folded or unfolded by reciprocation of the elliptical.

That is, the vehicle stated in the present disclosure generally means various structures that can be moved on water by a thrust generated by the propelling member 200, and the body 100 is assumed as a boat for convenience in the following description of the drawings.

The propelling member 200 is provided to be able to slide in the longitudinal direction of the body 100.

In detail, the propelling member 200 is disposed to be able to slide on the body 100. When the body 100 is configured in a boat type, the propelling member 20 is provided in a pair on both sides in the width direction of the body 100, respectively, so a user can longitudinally slide the propelling members 200 with both hands.

The blade 300 is disposed on a side of the propelling member 200 to be able to rotate forward and backward and is provided to be submerged in water.

In other words, the blade 300 is a plate having a predetermined area with a first end hinge-fastened to a surface of the propelling member 200 and a second end configured to be able to rotate forward and backward about the first end. The blade 300 can be rotated forward and backward by the current of water in the state in which it is entirely or partially submerged in water.

As shown in FIGS. 2 and 3, the blade 200 may include a blade holder 310 hinge-fastened to the propelling member 200 to rotate within set angles.

In detail, as shown in FIGS. 2A to 2C, the blade holder 310 has: a rotation groove 311 concaved inward on a surface of the propelling member 200 and hinge-fastened with the first end of the blade 300 inserted therein; a first stopper surface 312 forming a side of the rotation groove 311 and disposed in a vertical plane; and a second stopper surface 313 disposed to make a predetermined angle with the first stopper surface 312.

In other words, the first stopper surface 312 and the second stopper surface 313 are disposed in different planes, whereby a predetermined angle is maintained therebetween. Assuming that the vertical plane that the first stopper surface 312 faces is a reference angle of 0 degrees, the clockwise direction from the reference angle is a forward direction (+ direction), and the rotation angle of the blade 300 is α, the second stopper surface 313 is configured such that the blade 300 can rotate minimum 0 degrees to maximum α degrees or minimum −α degrees to maximum 0 degrees, in which the rotation angle is 0<α≤90.

That is, the blade 300 can rotate from 0 degrees to 90 degrees or from −90 degrees to 0 degrees.

Accordingly, when the rotation angle of the blade 300 is 0, one surface of the blade 300 is in contact with the first stopper surface 312, which is referred to as a full-unfolding state of the blade 300. When the rotation angle of the blade 300 is α degrees, another surface of the blade 300 is in contact with the second stopper surface 313, which is referred to as a full-folding state of the blade 300.

One or more blades 300 are provided, as shown in FIGS. 3A to 3C.

The blade 300 may be formed and used in various shapes. As shown in FIGS. 4A and 4B, the second end of the blade 300 is formed in an arc shape or a webfoot shape to reduce resistance of the current of water, that is, the blade 300 may be formed and used in various shapes.

The propelling principle of the present disclosure when the blade 300 is configured to be able to rotate 0˜α degrees and the propelling member 200 is reciprocated with the blade 300 in contact with the first stopper surface 312 and the propelling member 200 moved to a second side in the longitudinal direction is described hereafter.

1) Propelling Process

In the state described above, when the propelling member 200 is moved to a first side in the longitudinal direction, as shown in FIG. 5A, the blade 300 pushes water to the first side in the longitudinal direction and a force that pushes the blade 300 to the second side in the longitudinal direction is applied to the blade 300 by corresponding reaction.

The blade 300 can be rotated no more by the first stopper surface 312 and slide to the first side in the longitudinal direction while maintaining the unfolded state. Accordingly, the force due to reaction keeps being applied to the blade 300, so the vehicle is moved to the second side in the longitudinal direction.

2) Return Process

After the propelling process described above, when the propelling member 200 is moved to the second side from the first side in the longitudinal direction, as shown in FIG. 5B, opposite to the previous case, the blade 300 pushes water to the second side in the longitudinal direction and a force that pushes the blade 300 to the first side in the longitudinal direction is applied to the blade 300 by corresponding reaction.

Accordingly, the blade 300 rotates forward and come in contact with the second stopper surface 313, thereby being folded. In this state, when the propelling member 200 keeps being moved to the second side, the blade 300 keeps sliding to the second side in the longitudinal direction in the folded state with the resistance of the water, which is applied to the blade 300, decreased. Accordingly, the propelling member 200 can be returned to the initial position without influence on the vehicle.

Thereafter, when the propelling member 200 is moved again to the first side in the longitudinal direction (propelling process), the blade 300 is rotated in the opposite direction and moved in the unfolded state by reaction. Further, since a force by the reaction keeps being applied to the blade 300, the vehicle is moved to the second side.

The vehicle is gradually moved forward to the second side direction by repetition of this process.

On the other hand, when the blade 300 is configured to be able to rotate within the range of −α˜0 degrees, the rotation of the blade 300 due to operation of the propelling member 200 is changed in the opposite directions, so the propelling direction is changed to be opposite. Accordingly, the vehicle is gradually moved to the first side direction by operation of the propelling member 200.

As described above, according to the present disclosure, the vehicle is moved without a power source by a thrust that is a reaction force generated from the blade 300 by reciprocation from longitudinal first side to second side of the propelling member 200, so a simple propelling device can be achieved for the vehicle.

Accordingly, there is the advantage that the body 100 of the vehicle is not limited to a boat type and may be configured as various sports structures, leisure structures, etc.

The blade 300 may be changed in various shapes in the present disclosure to be able to stably cope with resistance of water.

For example, as shown in FIGS. 6 and 7, the blade holder 310 further includes an assistant seat 320 that is a plate having a predetermined area, having a flow hole 321 formed through the center thereof, and facing the blade 300.

The assistant seat 320 may be formed in various shapes that can stably support both the first end and the second end of the blade 300.

In detail, the assistant seat 320, as shown in FIG. 7A, is a flat plate, so it comes in close contact with a surface of the blade 300 and stably supports the blade when the blade 300 is unfolded in the propelling process, thereby being able to prevent the blade 300 from bending and a possibility of damage due to bending.

Alternately, the assistant seat 320 may be a bending plate, so it stably supports the first end and the second end of the blade 300 when the blade 300 is unfolded in the propelling process, thereby being able to bending and a possibility of damage of the blade 300.

According to the configuration described above, since the blade 300 slides while being supported by the assistant seat 320 in the propelling process, it is possible to more stably cope with resistance of water, so it is possible to prevent the blade 300 from bending. Further, the load that is applied to the hinge-fastened portion of the blade 300 is decreased, whereby the possibility of damage can be reduced.

On the other hand, in the return process, the blade 300 is easily moved and kept in contact with the second stopper surface 313 by the current of water passing through the flow hole 321, thereby not interfering with the return process of the propelling member 200.

The flow hole 321 is provided to correspond to the number of the blade 300. Accordingly, the flow hole 321 may be formed at each of a plurality of assistant seats 320 and the blade 300 may be provided for each of the assistant seats 320. Alternately, a plurality of flow holes 321 may be formed at one assistant seat 320 and a plurality of blades 300 may be provided and used.

Meanwhile, the blade 300 is fully folded in the return process and then should be fully unfolded by resistance of water in the propelling process. However, as described above, the blade 300 may be difficult to be returned to 0 degrees when it is at or close to the maximum rotation angle of 90 degrees.

Accordingly, in the present disclosure, as shown in FIG. 8A, the blade 300 further has a first protrusion 330 bent or curved toward the assistant seat 320 at the second end thereof. Accordingly, the blade 300 can be easily returned to 0 degrees even though it is at or close to the maximum rotation angle of 90 degrees.

In detail, when the blade 300 is at or close to the maximum rotation angle of 90 degrees, the end of the first protrusion 330 faces the assistant seat 320, so the blade 300 can be easily unfolded when the current of water presses the first protrusion 330 toward the assistant seat 320 in the propelling process.

When the blade 300 is in surface contact with the assistant seat 320, the first protrusion 330 is held by the assistant seat 320 and stably closes the flow hole 321 and the blade 300 is stably supported by the assistant seat 320. Accordingly, the propelling process can be more stably made.

Meanwhile, as shown in FIG. 8B, the blade 300 may further have a second protrusion 340 bent or curved away from the assistant seat 320 from a protruding end thereof.

In other words, the second protrusion 340 pumps up water in the direction in which the blade 300 is pushed while the current of water pushes the blade 300 in the propelling process, so the blade 200 is more easily rotated and the propelling operation of the propelling member 200 is more easily made.

Meanwhile, in the present disclosure, the blade 300 may further have an assistant propelling part 400, as shown in FIG. 9, to be able to move the propelling member 200 with smaller force in the return process.

In other words, the assistant propelling part 400 has an assistant flow hole 410 formed through the blade 300, and an assistant blade 420 hinge-fastened to the assistant flow hole 410. The assistant blade 420 is operated to close the assistant flow hole 410 in the propelling process of the blade 300 and open the assistant flow hole 410 in the return process of the blade 300.

That is, the assistant propelling part 400 selectively opens the assistant flow hole 410 while operating in the same propelling principle as the blade 300.

In detail, a stopping step 430 protruding inward is formed on the inner surface of the assistant flow hole 410. Accordingly, in the propelling process of the blade 300, the assistant blade 420 is not rotated stopped by the stopping step 430 and closes the assistant flow hole 410, whereby a thrust due to reaction can be generated at the blade 300.

Thereafter, in the return process, the blade 300 is rotated forward or backward and resistance of water decreases. Further, the assistant blade 420 is rotated in the same direction as the blade 300 by the current of water, whereby the assistant flow hole 410 is opened.

That is, when the blade 300 is rotated in one direction, water flows through the blade 300, so the resistance of water that is applied to the blade 300 in the return process decreases. Accordingly, return process can be more smoothly made.

Meanwhile, according to another embodiment of the present disclosure, as shown in FIGS. 10A and 10B, the propelling member 200 may be provided to be able to slide and reciprocate downward at an angle on the body 100.

In this case, the configuration and propelling principle of the blade 300 are the same as those described above. When the propelling member 200 is slid down to a first side at an angle, as shown in FIG. 10B, the blade 300 is fully unfolded, whereby a propelling process is made and the vehicle is moved forward. Thereafter, as shown in FIG. 10A, when the propelling member 200 is returned upward to a second side at an angle, the blade 300 is folded, whereby a return process is made.

Meanwhile, according to another embodiment of the present disclosure, as shown in FIGS. 11A and 11B, the propelling member 200 is provided on a side of the body 100 such that a side thereof can longitudinally reciprocate like a pendulum.

That is, the propelling member 200 can be longitudinally rotated and the blade 300 is disposed at an end of the propelling member 200. In this case, the configuration and propelling principle of the blade 300 are same. When the propelling member 200 is rotated to a first side in the longitudinal direction, as shown in FIG. 11A, the blade 300 is unfolded and the propelling process is made. On the contrary, when the propelling member 200 is rotated to a second side in the longitudinal direction, as shown in FIG. 11B, the blade 300 is folded and the return process is made.

Although exemplary embodiments of the present disclosure was described above, the right range of the present disclosure is not limited thereto and configurations that are in a range substantially equivalent to the embodiments of the present disclosure should be construed as being included in the right range of the present disclosure. Further, various modifications may be possible by those skilled in the art without departing from the spirit of the present disclosure. 

1. A vehicle using an action-reaction principle which is configured to be able to carry people and configured to be operated on water, the vehicle comprising: a body (100) configured to be able to carry people and having a predetermined volume; a propelling member (200) disposed on the body (100) to be able to slide and reciprocate; and a blade (300) disposed on a side of the propelling member (200) to be able to rotate forward and backward and provided to be submerged in water, wherein when the propelling member (200) is moved to a first side in a longitudinal direction, the blade 300 is unfolded and the body (100) is moved to a second side in the longitudinal direction by reaction generated by the water flow. 2-9. (canceled)
 10. The vehicle of claim 1, wherein the blade (300) includes a blade holder (310) hinge-fastened to the propelling member (200) to rotate within set angle ranges.
 11. The vehicle of claim 10, wherein the blade holder (310) includes: a rotation groove (311) concaved inward on a surface of the propelling member (200) and hinge-fastened with one end of the blade (300) inserted therein; a first stopper surface (312) forming a side of the rotation groove (311) and disposed in a vertical plane; and a second stopper surface (313) disposed to make a predetermined angle with the first stopper surface (312).
 12. The vehicle of claim 11, wherein, assuming that the vertical plane that the first stopper surface (312) faces is a reference angle of 0 degrees, a clockwise direction from the reference angle is a forward direction (+ direction), and a rotation angle of the blade (300) is α, the second stopper surface (313) is configured such that the blade (300) can rotate minimum 0 degrees to maximum α degrees or minimum −α degrees to maximum 0 degrees, and the rotation angle is 0<α≤90.
 13. The vehicle of claim 10, wherein the blade holder further includes an assistant seat (320) that is a plate having a predetermined area, has a flow hole (321) formed through a center thereof, and faces the blade (300).
 14. The vehicle of claim 13, wherein the blade (300) further includes a first protrusion (330) bent or curved toward the assistant seat (320) at a second end thereof.
 15. The vehicle of claim 1, wherein the body (100) is the hull of a boat, a sports structure, an aquatic structure, or a leisure structure.
 16. A vehicle using an action-reaction principle which is configured to be able to carry people and configured to be operated on water, the vehicle comprising: a body (100) configured to be able to carry people and having a predetermined volume; a propelling member (200) provided to be able to slide and reciprocate downward at an angle on the body (100); and a blade (300) disposed on a side of the propelling member (200) to be able to rotate forward and backward and provided to be submerged in water, wherein when the propelling member (200) is moved downward at an angle to a first side in a longitudinal direction, the blade 300 is unfolded and the body (100) is moved to a second side in a longitudinal direction by reaction generated by the water flow.
 17. The vehicle of claim 16, wherein the blade (300) includes a blade holder (310) hinge-fastened to the propelling member (200) to rotate within set angle ranges.
 18. The vehicle of claim 17, wherein the blade holder (310) includes: a rotation groove (311) concaved inward on a surface of the propelling member (200) and hinge-fastened with one end of the blade (300) inserted therein; a first stopper surface (312) forming a side of the rotation groove (311) and disposed in a vertical plane; and a second stopper surface (313) disposed to make a predetermined angle with the first stopper surface (312).
 19. The vehicle of claim 18, wherein, assuming that the vertical plane that the first stopper surface (312) faces is a reference angle of 0 degrees, a clockwise direction from the reference angle is a forward direction (+ direction), and a rotation angle of the blade (300) is α, the second stopper surface (313) is configured such that the blade (300) can rotate minimum 0 degrees to maximum α degrees or minimum −α degrees to maximum 0 degrees, and the rotation angle is 0<α≤90.
 20. The vehicle of claim 17, wherein the blade holder further includes an assistant seat (320) that is a plate having a predetermined area, has a flow hole (321) formed through a center thereof, and faces the blade (300).
 21. The vehicle of claim 20, wherein the blade (300) further includes a first protrusion (330) bent or curved toward the assistant seat (320) at a second end thereof.
 22. The vehicle of claim 16, wherein the body (100) is the hull of a boat, a sports structure, an aquatic structure, or a leisure structure.
 23. A vehicle using an action-reaction principle which is configured to be able to carry people and configured to be operated on water, the vehicle comprising: a body (100) configured to be able to carry people and having a predetermined volume; a propelling member (200) disposed on a side of the body (100) to be able to longitudinally reciprocate like a pendulum; and a blade (300) disposed on a side of the propelling member (200) to be able to rotate forward and backward and provided to be submerged in water, wherein when the propelling member (200) is moved downward at an angle to a first side in a longitudinal direction, the blade 300 is unfolded and the body (100) is moved to a second side in the longitudinal direction by reaction generated by the water flow.
 24. The vehicle of claim 23, wherein the blade (300) includes a blade holder (310) hinge-fastened to the propelling member (200) to rotate within set angle ranges.
 25. The vehicle of claim 24, wherein the blade holder (310) includes: a rotation groove (311) concaved inward on a surface of the propelling member (200) and hinge-fastened with one end of the blade (300) inserted therein; a first stopper surface (312) forming a side of the rotation groove (311) and disposed in a vertical plane; and a second stopper surface (313) disposed to make a predetermined angle with the first stopper surface (312).
 26. The vehicle of claim 25, wherein, assuming that the vertical plane that the first stopper surface (312) faces is a reference angle of 0 degrees, a clockwise direction from the reference angle is a forward direction (+ direction), and a rotation angle of the blade (300) is α, the second stopper surface (313) is configured such that the blade (300) can rotate minimum 0 degrees to maximum α degrees or minimum −α degrees to maximum 0 degrees, and the rotation angle is 0<α≤90.
 27. The vehicle of claim 24, wherein the blade holder further includes an assistant seat (320) that is a plate having a predetermined area, has a flow hole (321) formed through a center thereof, and faces the blade (300).
 28. The vehicle of claim 27, wherein the blade (300) further includes a first protrusion (330) bent or curved toward the assistant seat (320) at a second end thereof. 